1. For the classes of measurements frequency of one or more than one per day, generally these high frequencies are used in periods following fertilizer application or rainfall events, with lower frequencies in periods with low emission rates.

TABLE 17.
NO emissions from the data set (kg NO-N/year/ha)

N application rate (kg/ha)

0.0

1-100

100-200

>200

No. observations

21

45

16

17

Mean

0.3

0.5

0.5

5.4

Median

0.1

0.1

0.6

2.8

Balanced mean

1.7

2.4

2.5

4.3

Balanced median

0.2

0.8

1.0

1.7

Climate type

Clim1

Clim2

Clim3

Clim4

Clim5

Clim6

Clim7

Clim8

No. observations

19

34

18

0

18

10

0

0

Mean

1.1

1.1

1.0

-

2.7

0.1

-

-

Median

0.6

0.1

0.6

-

0.8

0.1

-

-

Balanced mean

-3.5

1.8

1.9

-

0.4

1.2

-

-

Balanced median

0.3

0.4

1.6

-

0.3

0.9

-

-

Soil organic C

<3.0

>3.0content (%)

No. observations

47

8

Mean

0.5

4.5

Median

0.1

0.4

Balanced mean

0.2

0.5

Balanced median

0.3

1.3

Soil Texture class

Coarse

Medium

Fine

No. observations

71

13

5

Mean

1.5

0.4

0.0

Median

0.2

0.2

0.0

Balanced mean

0.3

0.4

0.4

Balanced median

1.1

0.4

0.4

Soil drainage

Poor

Well

No. observations

7

60

Mean

0.5

1.8

Median

0.5

0.4

Balanced mean

-0.4

1.1

Balanced median

0.4

0.8

Soil pH

<5.5

>5.5

No. observations

23

53

Mean

1.7

0.3

Median

0.1

0.1

Balanced mean

0.6

0.1

Balanced median

0.8

0.4

Fertilizer type

AA

AF

AN

CAN

NF

Mix

No. observations

2

14

17

5

15

1

Mean

16.3

1.1

1.7

0.5

0.5

6.3

Median

16.3

0.2

0.4

0.4

0.1

6.3

Balanced mean

1.1

0.3

-0.2

-1.1

0.1

4.3

Balanced median

0.5

0.4

0.6

0.2

0.5

2.0

Fertilizer type

NP

O

OS

UUR

UAN

No. observations

0

3

0

19

1

Mean

-

0.6

-

1.3

1.0

Median

-

0.5

-

0.0

1.0

Balanced mean

-

-0.4

-

0.7

-0.5

Balanced median

-

0.2

-

0.5

4.2

Fertilizer application mode

b

bpi

i

s

No. observations

27

0

8

33

Mean

1.1

-

5.5

0.1

Median

0.8

-

0.4

0.0

Balanced mean

1.4

-

-1.1

-0.3

Balanced median

1.0

-

0.2

0.5

Timing of application

Single

Single/ps

Split

No. observations

28

3

6

Mean

1.7

3.1

0.7

Median

0.1

2.7

0.8

Balanced mean

1.8

-0.8

-1.3

Balanced median

0.5

1.0

0.5

Crop type

Grass

Grass-clover

Legume

Rice

Other

No. observations

23

0

16

2

51

Mean

1.9

-

0.7

1.4

1.3

Median

0.7

-

0.1

1.4

0.1

Balanced mean

1.0

-

1.7

-3.5

2.3

Balanced median

0.6

-

0.4

0.4

1.1

Measurement technique

c

cfd

No. observations

30

69

Mean

0.5

1.6

Median

0.5

0.1

Balanced mean

0.3

0.4

Balanced median

0.5

0.6

Length of experiment

<120

>120(days)

No. observations

64

35

Mean

0.4

3.0

Median

0.1

0.8

Balanced mean

-1.2

1.9

Balanced median

0.3

1.1

Measurement

>1m./d

1m./d

1m./2-3 d

1m./3-7 d

<1m./wfrequency 1

No. observations

51

20

8

10

2

Mean

0.2

2.9

4.6

0.9

0.7

Median

0.1

1.1

0.4

0.7

0.7

Balanced mean

-1.0

1.2

7.1

-2.0

-1.6

Balanced median

0.2

1.0

1.0

0.9

1.2

Reprinted from Bouwman et al., 2001b

1. For the classes of measurements frequency of one or more than one per day, generally these high frequencies are used in periods following fertilizer application or rainfall events, with lower frequencies in periods with low emission rates.